A sad day for emulation and open source advocates, and a reminder that Nintendo can and will destroy you if they see fit.
Hopefully their works will live in the saved repos just as ReVanced was able to live on after YouTube shut the original project down.
The repository removal was voluntary and done by the Yuzu team. GitHub doesn’t have to do anything and won’t do anything. Even when they receive a DMCA takedown, they only block forks made through GitHub’s “fork” button.